The relaxed greedy row and column selection [1]}, [2]}, [3]}, [4]}.
For \(k=0,1,2,\cdots \) , introducing two relaxation parameters \(\theta _1,\theta _2\in [0,1]\) , the row and column index sets are separately determined by
\(U_k=\left\lbrace i_k \Big | \psi _{i_k}(^{(k)}) \ge \theta _1\cdot \max _{i\in [m]}\left\lbrace  \psi _i(^{(k)}) \right\rbrace +(1-\theta _1)\cdot \sum _{i\in [m]} \omega _i \psi _{i}(^{(k)}), i_k\in [m]\right\rbrace \) 
